Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

How to use ShouldHaveRootCauseInstance class of org.assertj.core.error package

Best Assertj code snippet using org.assertj.core.error.ShouldHaveRootCauseInstance

Source:Throwables_assertHasRootCauseInstanceOf_Test.java

...12 */13package org.assertj.core.internal.throwables;14import org.assertj.core.api.AssertionInfo;15import org.assertj.core.api.Assertions;16import org.assertj.core.error.ShouldHaveRootCauseInstance;17import org.assertj.core.internal.ThrowablesBaseTest;18import org.assertj.core.test.TestData;19import org.assertj.core.test.TestFailures;20import org.assertj.core.util.FailureMessages;21import org.junit.jupiter.api.Test;22import org.mockito.Mockito;23/**24 * Tests for25 * {@link org.assertj.core.internal.Throwables#assertHasRootCauseInstanceOf(org.assertj.core.api.AssertionInfo, Throwable, Class)}26 * .27 *28 * @author Jean-Christophe Gay29 */30public class Throwables_assertHasRootCauseInstanceOf_Test extends ThrowablesBaseTest {31    private Throwable throwableWithCause = new Throwable(new Exception(new IllegalArgumentException()));32    @Test33    public void should_pass_if_root_cause_is_exactly_instance_of_expected_type() {34        throwables.assertHasRootCauseInstanceOf(TestData.someInfo(), throwableWithCause, IllegalArgumentException.class);35    }36    @Test37    public void should_pass_if_root_cause_is_instance_of_expected_type() {38        throwables.assertHasRootCauseInstanceOf(TestData.someInfo(), throwableWithCause, RuntimeException.class);39    }40    @Test41    public void should_fail_if_actual_is_null() {42        Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(someInfo(), null, .class)).withMessage(FailureMessages.actualIsNull());43    }44    @Test45    public void should_throw_NullPointerException_if_given_type_is_null() {46        Assertions.assertThatNullPointerException().isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(someInfo(), throwableWithCause, null)).withMessage("The given type should not be null");47    }48    @Test49    public void should_fail_if_actual_has_no_cause() {50        AssertionInfo info = TestData.someInfo();51        Class<NullPointerException> expectedCauseType = NullPointerException.class;52        try {53            throwables.assertHasRootCauseInstanceOf(info, ThrowablesBaseTest.actual, expectedCauseType);54        } catch (AssertionError err) {55            Mockito.verify(failures).failure(info, ShouldHaveRootCauseInstance.shouldHaveRootCauseInstance(ThrowablesBaseTest.actual, expectedCauseType));56            return;57        }58        TestFailures.failBecauseExpectedAssertionErrorWasNotThrown();59    }60    @Test61    public void should_fail_if_root_cause_is_not_instance_of_expected_type() {62        AssertionInfo info = TestData.someInfo();63        Class<NullPointerException> expectedCauseType = NullPointerException.class;64        try {65            throwables.assertHasRootCauseInstanceOf(info, throwableWithCause, expectedCauseType);66        } catch (AssertionError err) {67            Mockito.verify(failures).failure(info, ShouldHaveRootCauseInstance.shouldHaveRootCauseInstance(throwableWithCause, expectedCauseType));68            return;69        }70        TestFailures.failBecauseExpectedAssertionErrorWasNotThrown();71    }72}...

ShouldHaveRootCauseInstance

Using AI Code Generation

1public class ShouldHaveRootCauseInstance extends BasicErrorMessageFactory {2  private static final String SHOULD_HAVE_ROOT_CAUSE_INSTANCE = "%nExpecting root cause of%n  <%s>%nto be an instance of:%n  <%s>%nbut was an instance of:%n  <%s>.";3  public ShouldHaveRootCauseInstance(Throwable actual, Class<? extends Throwable> expectedType) {4    super(SHOULD_HAVE_ROOT_CAUSE_INSTANCE, actual, expectedType, actual.getCause().getClass());5  }6}7public void test_should_have_root_cause_instance() {8  Throwable actual = new Throwable(new IllegalArgumentException("argument is null"));9  ErrorMessageFactory factory = shouldHaveRootCauseInstance(actual, NullPointerException.class);10  String message = factory.create(new TextDescription("Test"), new StandardRepresentation());11  Assertions.assertThat(message).isEqualTo(String.format(12    "[Test] %nExpecting root cause of%n  <java.lang.Throwable: java.lang.IllegalArgumentException: argument is null>%nto be an instance of:%n  <java.lang.NullPointerException>%nbut was an instance of:%n  <java.lang.IllegalArgumentException>"));13}

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.